Wyatt-FOSS/wyatt-packages
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types/new_package #13

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hugo merged 2 commits from types/new_package into master 2022-07-18 14:55:22 +00:00
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packages/wyatt_type_utils/.gitignore vendored Normal file
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# Miscellaneous
*.class
*.lock
*.log
*.pyc
*.swp
.DS_Store
.atom/
.buildlog/
.history
.svn/
# IntelliJ related
*.iml
*.ipr
*.iws
.idea/*
# Visual Studio Code related
.classpath
.project
.settings/
.vscode/*
!.vscode/settings.json
!.vscode/extensions.json
# Flutter repo-specific
/bin/cache/
/bin/mingit/
/dev/benchmarks/mega_gallery/
/dev/bots/.recipe_deps
/dev/bots/android_tools/
/dev/docs/doc/
/dev/docs/flutter.docs.zip
/dev/docs/lib/
/dev/docs/pubspec.yaml
/dev/integration_tests/**/xcuserdata
/dev/integration_tests/**/Pods
/packages/flutter/coverage/
version
# packages file containing multi-root paths
.packages.generated
# Flutter/Dart/Pub related
**/doc/api/
**/ios/Flutter/.last_build_id
.dart_tool/
.flutter-plugins
.flutter-plugins-dependencies
.packages
.pub-cache/
.pub/
build/
flutter_*.png
linked_*.ds
unlinked.ds
unlinked_spec.ds
.fvm/
# Android related
**/android/**/gradle-wrapper.jar
**/android/.gradle
**/android/captures/
**/android/gradlew
**/android/gradlew.bat
**/android/local.properties
**/android/**/GeneratedPluginRegistrant.java
**/android/key.properties
**/android/.idea/
*.jks
# iOS/XCode related
**/ios/**/*.mode1v3
**/ios/**/*.mode2v3
**/ios/**/*.moved-aside
**/ios/**/*.pbxuser
**/ios/**/*.perspectivev3
**/ios/**/*sync/
**/ios/**/.sconsign.dblite
**/ios/**/.tags*
**/ios/**/.vagrant/
**/ios/**/DerivedData/
**/ios/**/Icon?
**/ios/**/Pods/
**/ios/**/.symlinks/
**/ios/**/profile
**/ios/**/xcuserdata
**/ios/.generated/
**/ios/Flutter/App.framework
**/ios/Flutter/Flutter.framework
**/ios/Flutter/Flutter.podspec
**/ios/Flutter/Generated.xcconfig
**/ios/Flutter/app.flx
**/ios/Flutter/app.zip
**/ios/Flutter/.last_build_id
**/ios/Flutter/flutter_assets/
**/ios/Flutter/flutter_export_environment.sh
**/ios/ServiceDefinitions.json
**/ios/Runner/GeneratedPluginRegistrant.*
# Coverage
coverage/
# Submodules
!pubspec.lock
packages/**/pubspec.lock
# Web related
lib/generated_plugin_registrant.dart
# Symbolication related
app.*.symbols
# Obfuscation related
app.*.map.json
# Exceptions to the above rules.
!**/ios/**/default.mode1v3
!**/ios/**/default.mode2v3
!**/ios/**/default.pbxuser
!**/ios/**/default.perspectivev3
!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
!/dev/ci/**/Gemfile.lock
!.vscode/extensions.json
!.vscode/launch.json
!.idea/codeStyles/
!.idea/dictionaries/
!.idea/runConfigurations/
# Omit committing pubspec.lock for library packages; see
# https://dart.dev/guides/libraries/private-files#pubspeclock.
pubspec.lock

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/*
* Copyright (C) 2022 WYATT GROUP
* Please see the AUTHORS file for details.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
{
"recommendations": [
"psioniq.psi-header",
"blaugold.melos-code"
]
}

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packages/wyatt_type_utils/.vscode/launch.json vendored Normal file
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{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"name": "Launch Example",
"request": "launch",
"type": "dart",
"cwd": "example/",
"program": "lib/main.dart",
"flutterMode": "debug"
},
]
}

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packages/wyatt_type_utils/.vscode/settings.json vendored Normal file
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{
"psi-header.changes-tracking": {
"isActive": true
},
"psi-header.config": {
"blankLinesAfter": 1,
"forceToTop": true
},
"psi-header.lang-config": [
{
"beforeHeader": [
"# -*- coding:utf-8 -*-",
"#!/usr/bin/env python3"
],
"begin": "###",
"end": "###",
"language": "python",
"prefix": "# "
},
{
"beforeHeader": [
"#!/usr/bin/env sh",
""
],
"language": "shellscript",
"begin": "",
"end": "",
"prefix": "# "
},
{
"begin": "",
"end": "",
"language": "dart",
"prefix": "// "
},
{
"begin": "",
"end": "",
"language": "yaml",
"prefix": "# "
},
{
"begin": "<!--",
"end": "-->",
"language": "markdown",
},
],
"psi-header.templates": [
{
"language": "*",
"template": [
"Copyright (C) <<year>> WYATT GROUP",
"Please see the AUTHORS file for details.",
"",
"This program is free software: you can redistribute it and/or modify",
"it under the terms of the GNU General Public License as published by",
"the Free Software Foundation, either version 3 of the License, or",
"any later version.",
"",
"This program is distributed in the hope that it will be useful,",
"but WITHOUT ANY WARRANTY; without even the implied warranty of",
"MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
"GNU General Public License for more details.",
"",
"You should have received a copy of the GNU General Public License",
"along with this program. If not, see <https://www.gnu.org/licenses/>."
],
}
],
"dart.runPubGetOnPubspecChanges": false,
}

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packages/wyatt_type_utils/AUTHORS Normal file
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# Below is a list of people and organizations that have contributed
# to this project. Names should be added to the list like so:
#
# Name/Organization <email address>
Wyatt Group S.A.S
Hugo Pointcheval <hugo.pointcheval@wyattapp.io>
Malo Léon <malo.leon@wyattapp.io>

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packages/wyatt_type_utils/CHANGELOG.md Normal file
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# 0.0.1
- TODO: Describe initial release.

674
packages/wyatt_type_utils/LICENSE Normal file
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GNU GENERAL PUBLIC LICENSE
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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You should have received a copy of the GNU General Public License
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Also add information on how to contact you by electronic and paper mail.
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The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
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<https://www.gnu.org/licenses/why-not-lgpl.html>.

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<!--
* Copyright (C) 2022 WYATT GROUP
* Please see the AUTHORS file for details.
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
-->
# Dart - Wyatt Type Utils
<p align="left">
<a href="https://git.wyatt-studio.fr/Wyatt-FOSS/wyatt-packages/src/branch/master/packages/wyatt_analysis">
<img src="https://img.shields.io/badge/Style-Wyatt%20Analysis-blue.svg?style=flat-square" alt="Style: Wyatt Analysis" />
</a>
<img src="https://img.shields.io/badge/SDK-Dart%20%7C%20Flutter-blue?style=flat-square" alt="SDK: Dart & Flutter" />
</p>
Type Utils for Dart & Flutter.
## Option\<T>
**Option** is a container object which may or may not contain a non-null value. If a **Value** is present, `isPresent()` will return true and `get()` will return the value. Additional methods that depend on the presence or absence of a contained value are provided, such as `orElse()` (return a default value if value not present) and `ifPresent()` (execute a block of code if the value is present).
```dart
final Option<int> rand = Option.ofNullable(
Random().nextBool() ? null : 10,
);
print(
"`rand` is${rand.isNull ? "" : " not"} null, "
"so it's value is ${rand.orElse(15)}",
);
// Ok, `orElse` is equivalent to ?? but the Option is
// useful for match pattern and other utils accesses.
rand.match((value) {
print('Value is: $value');
}, () {
print('Rand is null');
},
);
print('`rand` contains 10 ? => ${rand.contains(10)}');
```
## Result\<T, E>
**Result** type is coming from functional languages where exceptions are (rightfully) considered a side-effect, and therefore not appropriate to pass domain errors. Mind the difference between different kinds of errors: Some of them belong to domain, others don't.
*E.g. null reference exception or index out of bounds are not related to domain - they rather indicate a defect.*
Either is defined as a generic type with two branches
- success with **T**
- failure with **E**
It can appear in two forms, where it contains an object of **Ok**, or where it contains an object of **Err**. It cannot appear in both states at once, or in none of them. Therefore, if one possesses an **Result** instance, it either contains a successfully produced result, or contains an error object.
```dart
Future<Result<TodoModel, AppError>> requestTodo() async => Result.tryCatchAsync(
() => get('https://jsonplaceholder.typicode.com/todos/1'),
(error) => ServerError('Error while getting todo'),
);
final Result<TodoModel, AppError> todo1 = await requestTodo();
// In Flutter:
todo1.either(buildWidgetWithTodo, buildSizedBox);
```

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# Copyright (C) 2022 WYATT GROUP
# Please see the AUTHORS file for details.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
include: package:wyatt_analysis/analysis_options.yaml
analyzer:
exclude: "!example/**"

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
class AppError {
final String message;
const AppError(this.message);
@override
// ignore: no_runtimetype_tostring
String toString() => '$runtimeType: $message';
}
class ServerError extends AppError {
ServerError(super.message);
}
class ClientError extends AppError {
ClientError(super.message);
}

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
import 'dart:math';
import 'package:http/http.dart' as http;
import 'package:type_utils_example/error.dart';
import 'package:type_utils_example/todo.dart';
import 'package:wyatt_type_utils/wyatt_type_utils.dart';
Future<TodoModel> get(String url) async {
final res = await http.get(Uri.parse(url));
final todo = TodoModel.fromJson(res.body);
return todo;
}
Future<Result<TodoModel, AppError>> requestTodo() async => Result.tryCatchAsync(
() => get('https://jsonplaceholder.typicode.com/todos/1'),
(error) => ServerError('Error while getting todo'),
);
Future<Result<TodoModel, AppError>> requestBadTodo() async =>
Result.tryCatchAsync(
() => get('https://jsonplaceholder.typicode.com/todos/123897'),
(error) => ServerError('Error while getting todo'),
);
Future<void> main() async {
final Result<TodoModel, AppError> todo1 = await requestTodo();
todo1.either(print, print);
final Result<TodoModel, AppError> todo2 = await requestBadTodo();
todo2.either(print, print);
final Option<int> rand = Option.ofNullable(Random().nextBool() ? null : 10);
print(
"`rand` is${rand.isNull ? "" : " not"} null, "
"so it's value is ${rand.orElse(15)}",
);
// Ok, `orElse` is equivalent to ?? but the Option is useful for match pattern
rand.match((value) {
print('Value is: $value');
}, () {
print('Rand is null');
});
print('`rand` contains 10 ? => ${rand.contains(10)}');
}

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// ignore_for_file: public_member_api_docs, sort_constructors_first,
// ignore_for_file: avoid_equals_and_hash_code_on_mutable_classes
import 'dart:convert';
class TodoModel {
final int id;
final int userId;
final String title;
final bool completed;
TodoModel({
required this.id,
required this.userId,
required this.title,
required this.completed,
});
TodoModel copyWith({
int? id,
int? userId,
String? title,
bool? completed,
}) =>
TodoModel(
id: id ?? this.id,
userId: userId ?? this.userId,
title: title ?? this.title,
completed: completed ?? this.completed,
);
Map<String, dynamic> toMap() => <String, dynamic>{
'id': id,
'userId': userId,
'title': title,
'completed': completed,
};
factory TodoModel.fromMap(Map<String, dynamic> map) => TodoModel(
id: map['id'] as int,
userId: map['userId'] as int,
title: map['title'] as String,
completed: map['completed'] as bool,
);
String toJson() => json.encode(toMap());
factory TodoModel.fromJson(String source) =>
TodoModel.fromMap(json.decode(source) as Map<String, dynamic>);
@override
String toString() => 'TodoModel(id: $id, userId: $userId, title: '
'$title, completed: $completed)';
@override
bool operator ==(covariant TodoModel other) {
if (identical(this, other)) {
return true;
}
return other.id == id &&
other.userId == userId &&
other.title == title &&
other.completed == completed;
}
@override
int get hashCode =>
id.hashCode ^ userId.hashCode ^ title.hashCode ^ completed.hashCode;
}

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name: type_utils_example
description: A new Flutter project.
# The following line prevents the package from being accidentally published to
# pub.dev using `flutter pub publish`. This is preferred for private packages.
publish_to: "none" # Remove this line if you wish to publish to pub.dev
# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
environment:
sdk: ">=2.17.0 <3.0.0"
# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
dependencies:
http: ^0.13.4
wyatt_type_utils:
path: "../"
dev_dependencies:
wyatt_analysis:
git:
url: https://git.wyatt-studio.fr/Wyatt-FOSS/wyatt-packages
ref: wyatt_analysis-v2.1.0
path: packages/wyatt_analysis
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

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<!DOCTYPE html>
<html>
<head>
<!--
If you are serving your web app in a path other than the root, change the
href value below to reflect the base path you are serving from.
The path provided below has to start and end with a slash "/" in order for
it to work correctly.
For more details:
* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
This is a placeholder for base href that will be replaced by the value of
the `--base-href` argument provided to `flutter build`.
-->
<base href="$FLUTTER_BASE_HREF">
<meta charset="UTF-8">
<meta content="IE=Edge" http-equiv="X-UA-Compatible">
<meta name="description" content="A new Flutter project.">
<!-- iOS meta tags & icons -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="example">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<!-- Favicon -->
<link rel="icon" type="image/png" href="favicon.png"/>
<title>example</title>
<link rel="manifest" href="manifest.json">
<script>
// The value below is injected by flutter build, do not touch.
var serviceWorkerVersion = null;
</script>
<!-- This script adds the flutter initialization JS code -->
<script src="flutter.js" defer></script>
</head>
<body>
<script>
window.addEventListener('load', function(ev) {
// Download main.dart.js
_flutter.loader.loadEntrypoint({
serviceWorker: {
serviceWorkerVersion: serviceWorkerVersion,
}
}).then(function(engineInitializer) {
return engineInitializer.initializeEngine();
}).then(function(appRunner) {
return appRunner.runApp();
});
});
</script>
</body>
</html>

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{
"name": "example",
"short_name": "example",
"start_url": ".",
"display": "standalone",
"background_color": "#0175C2",
"theme_color": "#0175C2",
"description": "A new Flutter project.",
"orientation": "portrait-primary",
"prefer_related_applications": false,
"icons": [
{
"src": "icons/Icon-192.png",
"sizes": "192x192",
"type": "image/png"
},
{
"src": "icons/Icon-512.png",
"sizes": "512x512",
"type": "image/png"
},
{
"src": "icons/Icon-maskable-192.png",
"sizes": "192x192",
"type": "image/png",
"purpose": "maskable"
},
{
"src": "icons/Icon-maskable-512.png",
"sizes": "512x512",
"type": "image/png",
"purpose": "maskable"
}
]
}

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// // Copyright (C) 2022 WYATT GROUP
// // Please see the AUTHORS file for details.
// //
// // This program is free software: you can redistribute it and/or modify
// // it under the terms of the GNU General Public License as published by
// // the Free Software Foundation, either version 3 of the License, or
// // any later version.
// //
// // This program is distributed in the hope that it will be useful,
// // but WITHOUT ANY WARRANTY; without even the implied warranty of
// // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// // GNU General Public License for more details.
// //
// // You should have received a copy of the GNU General Public License
// // along with this program. If not, see <https://www.gnu.org/licenses/>.
// // ignore_for_file: avoid_positional_boolean_parameters
part 'future_result.dart';
part 'result.dart';
part 'option.dart';
mixin _Left<LeftType, RightType> on _EitherBase<LeftType, RightType> {}
mixin _Right<LeftType, RightType> on _EitherBase<LeftType, RightType> {}
class _EitherBaseException implements Exception {
final String message;
const _EitherBaseException(this.message);
@override
String toString() => '_EitherException: $message';
}
abstract class _EitherBase<LeftType, RightType> {
const _EitherBase();
bool get _isLeft => this is _Left<LeftType, RightType>;
bool get _isRight => this is _Right<LeftType, RightType>;
LeftType? get _left => _fold<LeftType?>(
(value) => value,
(right) => null,
);
RightType? get _right => _fold<RightType?>(
(left) => null,
(value) => value,
);
U _unwrap<U>() {
if (U == LeftType) {
return _fold<LeftType>(
(value) => value,
(right) => throw const ResultException(
'Illegal use. You should check left value before calling',
),
) as U;
}
if (U == RightType) {
return _fold<RightType>(
(left) => throw const ResultException(
'Illegal use. You should check right value before calling',
),
(value) => value,
) as U;
}
throw ResultException(
'Illegal use. You should use $LeftType or $RightType type',
);
}
Future<U> _unwrapAsync<U>() {
if (U == LeftType) {
return _foldAsync<LeftType>(
Future.value,
(right) => throw const ResultException(
'Illegal use. You should check left value before calling',
),
) as Future<U>;
}
if (U == RightType) {
return _foldAsync<RightType>(
(left) => throw const ResultException(
'Illegal use. You should check right value before calling',
),
Future.value,
) as Future<U>;
}
throw ResultException(
'Illegal use. You should use $LeftType or $RightType type',
);
}
U _fold<U>(
U Function(LeftType left) fnL,
U Function(RightType right) fnR,
);
Future<U> _foldAsync<U>(
Future<U> Function(LeftType left) fnL,
Future<U> Function(RightType right) fnR,
);
_EitherBase<U, RightType> _and<U>(
_EitherBase<U, RightType> res,
);
_EitherBase<LeftType, F> _or<F>(
_EitherBase<LeftType, F> res,
);
bool _contains<U>(U x);
LeftType _expect(String msg);
RightType _expectErr(String msg);
_EitherBase<U, RightType> _map<U>(
U Function(LeftType left) mapper,
);
Future<_EitherBase<U, RightType>> _mapAsync<U>(
Future<U> Function(LeftType left) mapper,
);
_EitherBase<LeftType, F> _mapErr<F>(
F Function(RightType right) mapper,
);
Future<_EitherBase<LeftType, F>> _mapErrAsync<F>(
Future<F> Function(RightType right) mapper,
);
_EitherBase<L, R> _either<L, R>(
L Function(LeftType left) fnL,
R Function(RightType right) fnR,
);
Future<_EitherBase<L, R>> _eitherAsync<L, R>(
Future<L> Function(LeftType left) fnL,
Future<R> Function(RightType right) fnR,
);
}

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
part of 'either_base.dart';
extension FutureResult<T, E> on Future<Result<T, E>> {
/// Represents the left side of [Result] class.
Future<bool> get isOk => then((result) => result.isOk);
/// Represents the right side of [Result] class.
Future<bool> get isErr => then((result) => result.isErr);
/// Get [U] value, may throw an exception.
Future<U> unwrap<U>() => then((result) => result.unwrap<U>());
/// Get **async** [U] value, may throw an exception.
///
/// With nullable, `Future(Future(U)) == Future(U)`
Future<U> unwrapAsync<U>() => then((result) => result.unwrapAsync<U>());
/// Fold [Ok] and [Err] into the value of one type
Future<U> fold<U>(
U Function(T value) valueTransformer,
U Function(E error) errorTransformer,
) =>
then((result) => result.fold(valueTransformer, errorTransformer));
/// Fold [Ok] and [Err] **asynchronously** into the value of one type
Future<U> foldAsync<U>(
Future<U> Function(T value) valueTransformer,
Future<U> Function(E error) errorTransformer,
) =>
then((result) => result.foldAsync(valueTransformer, errorTransformer));
/// Swap [Ok] and [Err]
Future<Result<E, T>> swap() => then((result) => result.swap());
/// Returns [res] if the [Result] is [Ok], otherwise returns
/// the [Err] value of this.
Future<Result<U, E>> and<U>(Result<U, E> res) =>
then((result) => result.and(res));
/// Returns [res] if the [Result] is [Err], otherwise returns
/// the [Ok] value of this.
Future<Result<T, F>> or<F>(Result<T, F> res) =>
then((result) => result.or(res));
/// Returns true if the result is an [Ok] or [Err] value containing
/// the given value/error.
Future<bool> contains<U>(U x) => then((result) => result.contains(x));
/// Returns the contained [Ok] value. Throw [ResultException] on [Err] with
/// its content.
Future<T> expect(String msg) => then((result) => result.expect(msg));
/// Returns the contained [Err] value. Throw [ResultException] on [Ok] with
/// its content.
Future<E> expectErr(String msg) => then((result) => result.expectErr(msg));
/// Maps a [Result<T, E>] to [Result<U, E>] by applying a function to a
/// contained [Ok] value, leaving an [Err] value untouched.
Future<Result<U, E>> map<U>(U Function(T value) mapper) =>
then((result) => result.map(mapper));
/// Maps a [Result<T, E>] to [Result<U, E>] by applying an **async** function
/// to a contained [Ok] value, leaving an [Err] value untouched.
Future<Result<U, E>> mapAsync<U>(Future<U> Function(T value) mapper) =>
then((result) => result.mapAsync(mapper));
/// Maps a [Result<T, E>] to [Result<T, F>] by applying a function to a
/// contained [Err] value, leaving an [Ok] value untouched.
Future<Result<T, F>> mapErr<F>(F Function(E error) mapper) =>
then((result) => result.mapErr(mapper));
/// Maps a [Result<T, E>] to [Result<U, E>] by applying an **async** function
/// to a contained [Err] value, leaving an [Ok] value untouched.
Future<Result<T, F>> mapErrAsync<F>(Future<F> Function(E error) mapper) =>
then((result) => result.mapErrAsync(mapper));
/// Transforms a [Result<T, E>] to [Result<U, F>] by applying functions to
/// contained [Ok] and [Err] values.
Future<Result<U, F>> either<U, F>(
U Function(T value) valueTransformer,
F Function(E error) errorTransformer,
) =>
then((result) => result.either(valueTransformer, errorTransformer));
/// Transforms a [Result<T, E>] to [Result<U, F>] by applying **async**
/// functions to contained [Ok] and [Err] values.
Future<Result<U, F>> eitherAsync<U, F>(
Future<U> Function(T value) valueTransformer,
Future<F> Function(E error) errorTransformer,
) =>
then((result) => result.eitherAsync(valueTransformer, errorTransformer));
}

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
part of 'either_base.dart';
/// {@template option_exception}
/// [OptionException] is sometimes threw by [Option] objects.
///
/// ```dart
/// throw OptionException('Emergency failure!');
/// ```
/// {@endtemplate}
class OptionException extends _EitherBaseException {
/// {@macro result_exception}
const OptionException(super.message);
@override
String toString() => 'OptionException: $message';
}
/// {@template option}
/// [Option] is a container object which may or may not contain a non-null
/// value. If a [Value] is present, isPresent() will return true and get()
/// will return the value.
///
/// Additional methods that depend on the presence or absence of
/// a contained value are provided, such as orElse() (return a default value
/// if value not present) and ifPresent() (execute a block of code if the
/// value is present).
/// {@endtemplate}
abstract class Option<T> extends _EitherBase<T, void> {
/// {@macro option}
const Option._();
/// Represents the left side of [Option] class.
bool get isPresent => _isLeft;
/// Represents the right side of [Option] class.
bool get isNull => _isRight;
/// Get nullable [Value].
T? get() => _left;
/// Get [U] value, may throw an exception.
U unwrap<U>() => _unwrap<U>();
/// Get **async** [U] value, may throw an exception.
Future<U> unwrapAsync<U>() => _unwrapAsync<U>();
/// Match [Value] and [None].
void match(
void Function(T value) value,
void Function() none,
) =>
_fold<void>(
(left) => value(left),
(right) => none(),
);
/// Match **async** [Value] and [None].
Future<void> matchAsync(
Future<void> Function(T value) value,
Future<void> Function() none,
) =>
_foldAsync<void>(
(left) => value(left),
(right) => none(),
);
/// If [Value] is present, invoke the specified consumer
/// with the value, otherwise do nothing.
void ifPresent(
void Function(T value) consumer,
) =>
_fold<void>(
(left) => consumer(left),
(right) => {},
);
/// Return the [Value] if present, otherwise return [other].
T orElse(
T other,
) =>
_fold<T>(
(left) => left,
(right) => other,
);
/// Return the [Value] if present, otherwise call and return result
/// of [supplier].
T orElseLazy(
T Function() supplier,
) =>
_fold<T>(
(left) => left,
(right) => supplier(),
);
/// Returns [res] if the [Option] is [Value], otherwise returns
/// the [None] value of this.
Option<U> and<U>(Option<U> res) => _and<U>(res) as Option<U>;
/// Returns [res] if the [Option] is [None], otherwise returns
/// the [Value] of this.
Option<T> or(Option<T> res) => _or<void>(res) as Option<T>;
/// Returns true if the result is a [Value].
bool contains<U>(U x) => _contains(x);
/// Returns the contained [Value]. Throw [OptionException] on [None].
T expect(String msg) => _expect(msg);
/// Maps a [Option<T>] to [Option<U>] by applying a function to a
/// contained [Value].
Option<U> map<U>(U Function(T value) mapper) => _map(mapper) as Option<U>;
/// Maps a [Option<T>] to [Option<U>] by applying an **async** function
/// to a contained [Value].
Future<Option<U>> mapAsync<U>(Future<U> Function(T value) mapper) async =>
await _mapAsync(mapper) as Option<U>;
/// Constructs an [Option] with the specified present non-null [Value].
static Value<T> of<T>(T value) {
if (value == null) {
throw const OptionException("Value can' be null. Use `ofNullable()`");
}
return ofNullable(value) as Value<T>;
}
/// Constructs an [Option] describing the specified [Value],
/// if non-null, otherwise returns a [None].
static Option<T> ofNullable<T>(T? value) {
if (value != null) {
return Value(value);
} else {
return None<T>();
}
}
/// Constructs an [Option] with the specified present non-null [Value].
static Value<T> ofLazy<T>(T Function() value) {
final v = value();
if (v == null) {
throw const OptionException("Value can' be null. Use `ofNullableLazy()`");
}
return ofNullable(v) as Value<T>;
}
/// Constructs an [Option] describing the specified [Value],
/// if non-null, otherwise returns a [None].
static Option<T> ofNullableLazy<T>(T? Function() value) {
final v = value();
if (v != null) {
return Value(v);
} else {
return None<T>();
}
}
}
class Value<T> extends Option<T> with _Left<T, void> {
final T value;
/// {@macro ok}
const Value(this.value) : super._();
@override
_EitherBase<U, void> _and<U>(_EitherBase<U, void> res) => res as Option<U>;
@override
bool _contains<U>(U x) => value == x;
@override
_EitherBase<L, R> _either<L, R>(
L Function(T left) fnL,
R Function(void right) fnR,
) =>
throw UnimplementedError();
@override
Future<_EitherBase<L, R>> _eitherAsync<L, R>(
Future<L> Function(T left) fnL,
Future<R> Function(void right) fnR,
) =>
throw UnimplementedError();
@override
T _expect(String msg) => value;
@override
void _expectErr(String msg) => throw UnimplementedError();
@override
U _fold<U>(U Function(T left) fnL, U Function(void right) fnR) => fnL(value);
@override
Future<U> _foldAsync<U>(
Future<U> Function(T left) fnL,
Future<U> Function(void right) fnR,
) =>
fnL(value);
@override
_EitherBase<U, void> _map<U>(U Function(T left) mapper) =>
Value(mapper(value));
@override
Future<_EitherBase<U, void>> _mapAsync<U>(
Future<U> Function(T left) mapper,
) =>
mapper(value).then(Value.new);
@override
_EitherBase<T, F> _mapErr<F>(F Function(void right) mapper) =>
throw UnimplementedError();
@override
Future<_EitherBase<T, F>> _mapErrAsync<F>(
Future<F> Function(void right) mapper,
) =>
throw UnimplementedError();
@override
_EitherBase<T, F> _or<F>(_EitherBase<T, F> res) => this as _EitherBase<T, F>;
}
class None<T> extends Option<T> with _Right<T, void> {
/// {@macro ok}
const None() : super._();
@override
_EitherBase<U, void> _and<U>(_EitherBase<U, void> res) => this as Option<U>;
@override
bool _contains<U>(U x) => false;
@override
_EitherBase<L, R> _either<L, R>(
L Function(T left) fnL,
R Function(void right) fnR,
) =>
throw UnimplementedError();
@override
Future<_EitherBase<L, R>> _eitherAsync<L, R>(
Future<L> Function(T left) fnL,
Future<R> Function(void right) fnR,
) =>
throw UnimplementedError();
@override
T _expect(String msg) => throw OptionException(msg);
@override
void _expectErr(String msg) => throw UnimplementedError();
@override
U _fold<U>(U Function(T left) fnL, U Function(void right) fnR) => fnR(null);
@override
Future<U> _foldAsync<U>(
Future<U> Function(T left) fnL,
Future<U> Function(void right) fnR,
) =>
fnR(null);
@override
_EitherBase<U, void> _map<U>(U Function(T left) mapper) => None<U>();
@override
Future<_EitherBase<U, void>> _mapAsync<U>(
Future<U> Function(T left) mapper,
) =>
Future.value(None<U>());
@override
_EitherBase<T, F> _mapErr<F>(F Function(void right) mapper) =>
throw UnimplementedError();
@override
Future<_EitherBase<T, F>> _mapErrAsync<F>(
Future<F> Function(void right) mapper,
) =>
throw UnimplementedError();
@override
_EitherBase<T, F> _or<F>(_EitherBase<T, F> res) => res;
}

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// ignore_for_file: avoid_positional_boolean_parameters
part of 'either_base.dart';
/// {@template result_exception}
/// [ResultException] is sometimes threw by [Result] objects.
///
/// ```dart
/// throw ResultException('Emergency failure!');
/// ```
/// {@endtemplate}
class ResultException extends _EitherBaseException {
/// {@macro result_exception}
const ResultException(super.message);
@override
String toString() => 'ResultException: $message';
}
/// {@template result}
/// [Result] type is coming from functional languages where exceptions are
/// (rightfully) considered a side-effect, and therefore not appropriate to
/// pass domain errors. Mind the difference between different kinds of errors:
/// Some of them belong to domain, others don't.
///
/// *E.g. null reference exception or index out of bounds
/// are not related to domain - they rather indicate a defect.*
///
/// Either is defined as a generic type with two branches
/// - success with [T]
/// - failure with [E]
///
/// It can appear in two forms, where
/// it contains an object of [Ok], or where it contains an object
/// of [Err]. It cannot appear in both states at once, or in none of them.
/// Therefore, if one possesses an [Result] instance, it either contains a
/// successfully produced result, or contains an error object.
/// {@endtemplate}
abstract class Result<T, E> extends _EitherBase<T, E> {
/// {@macro result}
const Result._();
/// Represents the left side of [Result] class.
bool get isOk => _isLeft;
/// Represents the right side of [Result] class.
bool get isErr => _isRight;
/// Get nullable [Ok] value, and discarding the error, if any.
T? get ok => _left;
/// Get nullable [Err] value, and discarding the success value, if any.
E? get err => _right;
/// Get [U] value, may throw an exception.
U unwrap<U>() => _unwrap<U>();
/// Get **async** [U] value, may throw an exception.
Future<U> unwrapAsync<U>() => _unwrapAsync<U>();
/// Fold [Ok] and [Err] into the value of one type
U fold<U>(
U Function(T value) valueTransformer,
U Function(E error) errorTransformer,
) =>
_fold(
(left) => valueTransformer(left),
(right) => errorTransformer(right),
);
/// Fold [Ok] and [Err] **asynchronously** into the value of one type
Future<U> foldAsync<U>(
Future<U> Function(T value) valueTransformer,
Future<U> Function(E error) errorTransformer,
) =>
_foldAsync(
(left) => valueTransformer(left),
(right) => errorTransformer(right),
);
/// Swap [Ok] and [Err]
Result<E, T> swap() => fold(Err.new, Ok.new);
/// Returns [res] if the [Result] is [Ok], otherwise returns
/// the [Err] value of this.
Result<U, E> and<U>(Result<U, E> res) => _and<U>(res) as Result<U, E>;
/// Returns [res] if the [Result] is [Err], otherwise returns
/// the [Ok] value of this.
Result<T, F> or<F>(Result<T, F> res) => _or<F>(res) as Result<T, F>;
/// Returns true if the result is an [Ok] or [Err] value containing
/// the given value/error.
bool contains<U>(U x) => _contains(x);
/// Returns the contained [Ok] value. Throw [ResultException] on [Err] with
/// its content.
T expect(String msg) => _expect(msg);
/// Returns the contained [Err] value. Throw [ResultException] on [Ok] with
/// its content.
E expectErr(String msg) => _expectErr(msg);
/// Maps a [Result<T, E>] to [Result<U, E>] by applying a function to a
/// contained [Ok] value, leaving an [Err] value untouched.
Result<U, E> map<U>(U Function(T value) mapper) =>
_map(mapper) as Result<U, E>;
/// Maps a [Result<T, E>] to [Result<U, E>] by applying an **async** function
/// to a contained [Ok] value, leaving an [Err] value untouched.
Future<Result<U, E>> mapAsync<U>(Future<U> Function(T value) mapper) =>
_mapAsync(mapper) as Future<Result<U, E>>;
/// Maps a [Result<T, E>] to [Result<T, F>] by applying a function to a
/// contained [Err] value, leaving an [Ok] value untouched.
Result<T, F> mapErr<F>(F Function(E error) mapper) =>
_mapErr(mapper) as Result<T, F>;
/// Maps a [Result<T, E>] to [Result<U, E>] by applying an **async** function
/// to a contained [Err] value, leaving an [Ok] value untouched.
Future<Result<T, F>> mapErrAsync<F>(Future<F> Function(E error) mapper) =>
_mapErrAsync(mapper) as Future<Result<T, F>>;
/// Transforms a [Result<T, E>] to [Result<U, F>] by applying functions to
/// contained [Ok] and [Err] values.
Result<U, F> either<U, F>(
U Function(T value) valueTransformer,
F Function(E error) errorTransformer,
) =>
_either<U, F>(valueTransformer, errorTransformer) as Result<U, F>;
/// Transforms a [Result<T, E>] to [Result<U, F>] by applying **async**
/// functions to contained [Ok] and [Err] values.
Future<Result<U, F>> eitherAsync<U, F>(
Future<U> Function(T value) valueTransformer,
Future<F> Function(E error) errorTransformer,
) =>
_eitherAsync<U, F>(valueTransformer, errorTransformer)
as Future<Result<U, F>>;
/// Constructs a new [Result] from a function that might throw
static Result<T, E> tryCatch<T, E, Error extends Object>(
T Function() tryFn,
E Function(Error error) onError,
) {
try {
return Ok(tryFn());
} on Error catch (e) {
return Err(onError(e));
}
}
/// Constructs a new [Result] from an **async** function that might throw
static Future<Result<T, E>> tryCatchAsync<T, E, Error extends Object>(
Future<T> Function() tryFn,
E Function(Error error) onError,
) async {
try {
return Ok(await tryFn());
} on Error catch (e) {
return Err(onError(e));
}
}
/// If the condition is satify then return [value] in
/// [Ok] else [error] in [Err]
static Result<T, E> conditional<T, E>(
bool test,
T value,
E error,
) =>
test ? Ok(value) : Err(error);
/// If the condition is satify then return *command* [value]
/// in [Ok] else [error] in [Err]
static Result<T, E> conditionalLazy<T, E>(
bool test,
T Function() value,
E Function() error,
) =>
test ? Ok(value()) : Err(error());
}
/// {@template ok}
/// Contains the success value of a [Result]
///
/// {@macro result}
/// {@endtemplate}
class Ok<T, E> extends Result<T, E> with _Left<T, E> {
final T value;
/// {@macro ok}
const Ok(this.value) : super._();
@override
U _fold<U>(U Function(T left) fnL, U Function(E right) fnR) => fnL(value);
@override
Future<U> _foldAsync<U>(
Future<U> Function(T left) fnL,
Future<U> Function(E right) fnR,
) =>
fnL(value);
@override
Result<U, E> _and<U>(_EitherBase<U, E> res) => res as Result<U, E>;
@override
Result<T, F> _or<F>(_EitherBase<T, F> res) => this as Result<T, F>;
@override
bool _contains<U>(U x) => value == x;
@override
T _expect(String msg) => value;
@override
E _expectErr(String msg) => throw ResultException('$msg: $value');
@override
Result<U, E> _map<U>(U Function(T value) mapper) => Ok(mapper(value));
@override
Future<Result<U, E>> _mapAsync<U>(Future<U> Function(T value) mapper) =>
mapper(value).then(Ok.new);
@override
Result<T, F> _mapErr<F>(F Function(E error) mapper) => Ok(value);
@override
Future<Result<T, F>> _mapErrAsync<F>(Future<F> Function(E error) mapper) =>
Future.value(Ok(value));
@override
Result<U, F> _either<U, F>(
U Function(T value) fnL,
F Function(E error) fnR,
) =>
Ok(fnL(value));
@override
Future<Result<U, F>> _eitherAsync<U, F>(
Future<U> Function(T value) fnL,
Future<F> Function(E error) fnR,
) =>
fnL(value).then(Ok.new);
}
/// {@template err}
/// Contains the error value of a [Result]
///
/// {@macro result}
/// {@endtemplate}
class Err<T, E> extends Result<T, E> with _Right<T, E> {
final E error;
/// {@macro err}
const Err(this.error) : super._();
@override
U _fold<U>(U Function(T left) fnL, U Function(E right) fnR) => fnR(error);
@override
Future<U> _foldAsync<U>(
Future<U> Function(T left) fnL,
Future<U> Function(E right) fnR,
) =>
fnR(error);
@override
Result<U, E> _and<U>(_EitherBase<U, E> res) => this as Result<U, E>;
@override
Result<T, F> _or<F>(_EitherBase<T, F> res) => res as Result<T, F>;
@override
bool _contains<U>(U x) => error == x;
@override
T _expect(String msg) => throw ResultException('$msg: $error');
@override
E _expectErr(String msg) => error;
@override
Result<U, E> _map<U>(U Function(T value) mapper) => Err(error);
@override
Future<Result<U, E>> _mapAsync<U>(Future<U> Function(T value) mapper) =>
Future.value(Err(error));
@override
Result<T, F> _mapErr<F>(F Function(E error) mapper) => Err(mapper(error));
@override
Future<Result<T, F>> _mapErrAsync<F>(Future<F> Function(E error) mapper) =>
mapper(error).then(Err.new);
@override
Result<U, F> _either<U, F>(
U Function(T value) fnL,
F Function(E error) fnR,
) =>
Err(fnR(error));
@override
Future<Result<U, F>> _eitherAsync<U, F>(
Future<U> Function(T value) fnL,
Future<F> Function(E error) fnR,
) =>
fnR(error).then(Err.new);
}

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
export 'either_base.dart';

20
packages/wyatt_type_utils/lib/wyatt_type_utils.dart Normal file
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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
/// Type Utils
library wyatt_type_utils;
export 'src/src.dart';

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name: wyatt_type_utils
description: Either, Option and other useful types.
repository: https://git.wyatt-studio.fr/Wyatt-FOSS/wyatt-packages/src/branch/master/packages/wyatt_type_utils
version: 0.0.1
environment:
sdk: '>=2.17.0 <3.0.0'
dev_dependencies:
test: ^1.21.4
wyatt_analysis:
git:
url: https://git.wyatt-studio.fr/Wyatt-FOSS/wyatt-packages
ref: wyatt_analysis-v2.2.1
path: packages/wyatt_analysis

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
import 'package:test/test.dart';
import 'package:wyatt_type_utils/src/either_base.dart';
void main() {
group('Option<T>', () {
test('`isPresent` returns true on not null value', () {
expect(
const Value<int>(10).isPresent,
true,
);
expect(
const None<int>().isPresent,
false,
);
});
test('`isNull` returns true on null value', () {
expect(
const Value<int>(10).isNull,
false,
);
expect(
const None<int>().isNull,
true,
);
});
test('`get` returns value', () {
const Option<int> x = Value(2);
expect(x.get(), 2);
const Option<int> y = None();
expect(y.get(), null);
});
test('unwrap() returns value on Value', () {
const Option<int> x = Value(2);
expect(x.unwrap<int>(), 2);
expect(() => x.unwrap<String>(), throwsA(isException));
});
test('unwrap() throws on None', () {
const Option<int> x = None();
expect(() => x.unwrap<int>(), throwsA(isException));
});
test('unwrapAsync() returns value on Value', () async {
const Option<int> x = Value(2);
expect(await x.unwrapAsync<int>(), 2);
expect(() async => x.unwrapAsync<String>(), throwsA(isException));
});
test('unwrapAsync() throws on Nonce', () async {
const Option<int> x = None();
expect(() async => x.unwrapAsync<int>(), throwsA(isException));
});
test('ifPresent() invokes command on Value', () {
const Value<int>(2).ifPresent(
print,
);
});
test('orElse() returns value', () {
expect(
const Value<int>(10).orElse(12),
10,
);
expect(
const None<int>().orElse(12),
12,
);
});
test('orElseLazy() returns value', () {
expect(
const Value<int>(10).orElseLazy(() => 12),
10,
);
expect(
const None<int>().orElseLazy(() => 12),
12,
);
});
test(
'and() returns res if the option is `Value`, otherwise '
'returns `None`.',
() {
const Option<int> x1 = Value(2);
const Option<int> y1 = None();
expect(x1.and(y1), y1);
const Option<String> x2 = None();
const Option<String> y2 = Value('foo');
expect(x2.and(y2), x2);
const Option<String> x3 = None();
const Option<String> y3 = None();
expect(x3.and(y3), x3);
const Option<dynamic> x4 = Value(2);
const Option<dynamic> y4 = Value('different Option type');
expect(x4.and(y4), y4);
const Option<int> x5 = Value(2);
const Option<int> y5 = Value(5);
expect(x5.and(y5), y5);
},
);
test(
'or() returns res if the option is `None`, otherwise '
'returns the `Value`.',
() {
const Option<int> x1 = Value(2);
const Option<int> y1 = None();
expect(x1.or(y1), x1);
const Option<String> x2 = None();
const Option<String> y2 = Value('foo');
expect(x2.or(y2), y2);
const Option<void> x3 = None();
const Option<void> y3 = None();
expect(x3.or(y3), y3);
const Option<dynamic> x4 = Value(2);
const Option<dynamic> y4 = Value('different result type');
expect(x4.or(y4), x4);
const Option<int> x5 = Value(2);
const Option<int> y5 = Value(5);
expect(x5.or(y5), x5);
},
);
test(
'contains() returns true if the option is '
'containing the given value.',
() {
const Option<int> x1 = Value(2);
expect(x1.contains(2), true);
expect(x1.contains(3), false);
const Option<String> x2 = None();
expect(x2.contains(2), false);
},
);
test(
'expect() return value if the option is a Value '
'else throw Exception',
() {
const Option<int> x1 = Value(2);
expect(x1.expect('Testing expect'), 2);
const Option<int> x2 = None();
expect(
() => x2.expect('Testing expect'),
throwsA(
predicate<OptionException>(
(e) => e.message == ('Testing expect'),
),
),
);
},
);
test(
'map() transforms Value.',
() {
const Option<bool> x1 = Value(true);
expect(x1.get(), true);
expect(x1.map((value) => false).get(), false);
const Option<bool> x2 = None();
expect(x2.map((value) => false).isNull, true);
},
);
test(
'mapAsync() transforms Value.',
() async {
const Option<bool> x1 = Value(true);
expect(x1.get(), true);
expect(
(await x1.mapAsync((value) => Future.value(false))).get(),
false,
);
const Option<bool> x2 = None();
expect(
(await x2.mapAsync((value) => Future.value(false))).isNull,
true,
);
},
);
test(
'of(T value) returns Option with Value',
() {
final Option<int> x1 = Option.of(2);
expect(x1.contains(2), true);
expect(x1.contains(3), false);
expect(
() => Option.of(null),
throwsA(
predicate<OptionException>(
(e) => e.message == ("Value can' be null. Use `ofNullable()`"),
),
),
);
},
);
test(
"ofNullable(T value) returns Option with Value and don't throw on Null",
() {
final Option<int> x1 = Option.ofNullable(2);
expect(x1.contains(2), true);
expect(x1.contains(3), false);
final Option<int> x2 = Option.ofNullable(null);
expect(x2.isNull, true);
},
);
test(
'ofLazy() returns Option with Value',
() {
final Option<int> x1 = Option.ofLazy(() => 2);
expect(x1.contains(2), true);
expect(x1.contains(3), false);
expect(
() => Option.ofLazy(() => null),
throwsA(
predicate<OptionException>(
(e) =>
e.message == ("Value can' be null. Use `ofNullableLazy()`"),
),
),
);
},
);
test(
"ofNullableLazy() returns Option with Value and don't throw on Null",
() {
final Option<int> x1 = Option.ofNullableLazy(() => 2);
expect(x1.contains(2), true);
expect(x1.contains(3), false);
final Option<int> x2 = Option.ofNullableLazy(() => null);
expect(x2.isNull, true);
},
);
});
}

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// Copyright (C) 2022 WYATT GROUP
// Please see the AUTHORS file for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
import 'package:test/test.dart';
import 'package:wyatt_type_utils/src/either_base.dart';
void main() {
group('Result<T,E>', () {
test('`isOk` returns true on Ok value', () {
expect(
const Ok<void, void>(null).isOk,
true,
);
expect(
const Err<void, void>(null).isOk,
false,
);
});
test('`isErr` returns true on Err value', () {
expect(
const Ok<void, void>(null).isErr,
false,
);
expect(
const Err<void, void>(null).isErr,
true,
);
});
test('`ok` returns value on Ok value', () {
const Result<int, String> x = Ok(2);
expect(x.ok, 2);
expect(x.err, null);
});
test('`err` returns error on Err value', () {
const Result<int, String> x = Err('error');
expect(x.ok, null);
expect(x.err, 'error');
});
test('unwrap() returns value on Ok value', () {
const Result<int, String> x = Ok(2);
expect(x.unwrap<int>(), 2);
expect(() => x.unwrap<String>(), throwsA(isException));
});
test('unwrap() returns error on Err value', () {
const Result<int, String> x = Err('error');
expect(x.unwrap<String>(), 'error');
expect(() => x.unwrap<int>(), throwsA(isException));
});
test('unwrapAsync() returns value on Ok value', () async {
const Result<int, String> x = Ok(2);
expect(await x.unwrapAsync<int>(), 2);
expect(() async => x.unwrapAsync<String>(), throwsA(isException));
});
test('unwrapAsync() returns error on Err value', () async {
const Result<int, String> x = Err('error');
expect(await x.unwrapAsync<String>(), 'error');
expect(() async => x.unwrapAsync<int>(), throwsA(isException));
});
test('fold() returns right value', () {
expect(
const Ok<String, String>('')
.fold<bool>((left) => true, (right) => false),
true,
);
expect(
const Err<String, String>('')
.fold<bool>((left) => true, (right) => false),
false,
);
});
test('foldAsync() returns right value', () async {
expect(
await const Ok<String, String>('').foldAsync<bool>(
(left) => Future.value(true),
(right) => Future.value(false),
),
true,
);
expect(
await const Err<String, String>('').foldAsync<bool>(
(left) => Future.value(true),
(right) => Future.value(false),
),
false,
);
});
test('swap() swaps values', () {
const Result<int, int> x = Ok(10);
expect(x.isOk, true);
expect(x.isErr, false);
expect(x.ok, 10);
final Result<int, int> y = x.swap();
expect(y.isOk, false);
expect(y.isErr, true);
expect(y.err, 10);
});
test(
'and() returns res if the result is `Ok`, otherwise '
'returns the `Err` value of this.',
() {
const Result<int, String> x1 = Ok(2);
const Result<int, String> y1 = Err('late error');
expect(x1.and(y1), y1);
const Result<String, String> x2 = Err('early error');
const Result<String, String> y2 = Ok('foo');
expect(x2.and(y2), x2);
const Result<void, String> x3 = Err('not a 2');
const Result<void, String> y3 = Err('late error');
expect(x3.and(y3), x3);
const Result<dynamic, void> x4 = Ok(2);
const Result<dynamic, void> y4 = Ok('different result type');
expect(x4.and(y4), y4);
const Result<int, void> x5 = Ok(2);
const Result<int, void> y5 = Ok(5);
expect(x5.and(y5), y5);
},
);
test(
'or() returns res if the result is `Err`, otherwise '
'returns the `Ok` value of this.',
() {
const Result<int, String> x1 = Ok(2);
const Result<int, String> y1 = Err('late error');
expect(x1.or(y1), x1);
const Result<String, String> x2 = Err('early error');
const Result<String, String> y2 = Ok('foo');
expect(x2.or(y2), y2);
const Result<void, String> x3 = Err('not a 2');
const Result<void, String> y3 = Err('late error');
expect(x3.or(y3), y3);
const Result<dynamic, void> x4 = Ok(2);
const Result<dynamic, void> y4 = Ok('different result type');
expect(x4.or(y4), x4);
const Result<int, void> x5 = Ok(2);
const Result<int, void> y5 = Ok(5);
expect(x5.or(y5), x5);
},
);
test(
'contains() returns true if the result is an Ok value '
'containing the given value.',
() {
const Result<int, void> x1 = Ok(2);
expect(x1.contains(2), true);
expect(x1.contains(3), false);
const Result<void, String> x2 = Err('Some error message');
expect(x2.contains(2), false);
},
);
test(
'expect() return value if the result is an Ok value '
'else throw Exception',
() {
const Result<int, String> x1 = Ok(2);
expect(x1.expect('Testing expect'), 2);
const Result<int, String> x2 = Err('emergency failure');
expect(
() => x2.expect('Testing expect'),
throwsA(
predicate<ResultException>(
(e) => e.message == ('Testing expect: emergency failure'),
),
),
);
},
);
test(
'expectErr() return value if the result is an Err value '
'else throw Exception',
() {
const Result<String, int> x1 = Err(2);
expect(x1.expectErr('Testing expect err'), 2);
const Result<String, int> x2 = Ok('success value');
expect(
() => x2.expectErr('Testing expect err'),
throwsA(
predicate<ResultException>(
(e) => e.message == ('Testing expect err: success value'),
),
),
);
},
);
test(
'map() transforms Ok value.',
() {
const Result<bool, void> x1 = Ok(true);
expect(x1.ok, true);
expect(x1.map((value) => false).ok, false);
const Result<bool, String> x2 = Err('oops');
expect(x2.map((value) => false).isErr, true);
},
);
test(
'mapErr() transforms Err value.',
() {
const Result<bool, String> x1 = Ok(true);
expect(x1.mapErr((value) => false).isOk, true);
const Result<bool, String> x2 = Err('oops');
expect(x2.err, 'oops');
expect(x2.mapErr((error) => 'failure').err, 'failure');
},
);
test(
'mapAsync() transforms Ok value.',
() async {
const Result<bool, void> x1 = Ok(true);
expect(x1.ok, true);
expect((await x1.mapAsync((value) => Future.value(false))).ok, false);
const Result<bool, String> x2 = Err('oops');
expect((await x2.mapAsync((value) => Future.value(false))).isErr, true);
},
);
test(
'mapErrAsync() transforms Err value.',
() async {
const Result<bool, String> x1 = Ok(true);
expect(
(await x1.mapErrAsync((value) => Future.value(false))).isOk,
true,
);
const Result<bool, String> x2 = Err('oops');
expect(x2.err, 'oops');
expect(
(await x2.mapErrAsync((error) => Future.value('failure'))).err,
'failure',
);
},
);
test(
'either() transforms values.',
() {
const Result<bool, bool> x1 = Ok(true);
final Result<int, String> y1 =
x1.either<int, String>((value) => 1, (error) => 'error');
expect(y1.isOk, true);
expect(y1.ok, 1);
const Result<bool, bool> x2 = Err(true);
final Result<int, String> y2 =
x2.either<int, String>((value) => 1, (error) => 'error');
expect(y2.isErr, true);
expect(y2.err, 'error');
},
);
test(
'eitherAsync() transforms values.',
() async {
const Result<bool, bool> x1 = Ok(true);
final Result<int, String> y1 = await x1.eitherAsync<int, String>(
(value) => Future.value(1),
(error) => Future.value('error'),
);
expect(y1.isOk, true);
expect(y1.ok, 1);
const Result<bool, bool> x2 = Err(true);
final Result<int, String> y2 = await x2.eitherAsync<int, String>(
(value) => Future.value(1),
(error) => Future.value('error'),
);
expect(y2.isErr, true);
expect(y2.err, 'error');
},
);
test(
'tryCatch() try and catch error as Err.',
() {
expect(
Result.tryCatch<int, String, Exception>(
() => throw Exception('not success'),
(err) => 'error',
).isErr,
true,
);
expect(
Result.tryCatch<int, String, Exception>(
() => 2,
(err) => 'error',
).isOk,
true,
);
},
);
test(
'tryCatchAsync() try and catch error as Err.',
() async {
expect(
(await Result.tryCatchAsync<int, String, Exception>(
() => throw Exception('not success'),
(err) => 'error',
)).isErr,
true,
);
expect(
(await Result.tryCatchAsync<int, String, Exception>(
() => Future.value(2),
(err) => 'error',
)).isOk,
true,
);
},
);
test(
'conditional() returns Result on true test',
() {
final Result<int, String> x1 = Result.conditional<int, String>(
false,
2,
'error',
);
expect(
x1.isErr,
true,
);
expect(x1.err, 'error');
final Result<int, String> x2 = Result.conditional<int, String>(
true,
2,
'error',
);
expect(
x2.isOk,
true,
);
expect(x2.ok, 2);
},
);
test(
'conditionalLazy() returns Result on true test',
() {
final Result<int, String> x1 = Result.conditionalLazy<int, String>(
false,
() => 2,
() => 'error',
);
expect(
x1.isErr,
true,
);
expect(x1.err, 'error');
final Result<int, String> x2 = Result.conditionalLazy<int, String>(
true,
() => 2,
() => 'error',
);
expect(
x2.isOk,
true,
);
expect(x2.ok, 2);
},
);
});
}